Swimming pool filter tank



P 9,1953 J. MORINO I 2,851,164

SWIMMING POOL FILTER TANK Filed Feb'. 1'7, 1956 /7 1-" Z z/ 7T- 2 .20

E1900: pump IN VEN TOR.

"A T Tommy's United States Patent SWIMMING POOL FILTER TANK John Morino,Sherman Oaks, Calif. Application February 17, 1956, Serial No. 566,117 2Claims. (Cl. 210-433) This invention relates to filtering systems andhas as its general object to provide an improved arrangement forcleaning a swimming pool filter when clogged with collected refuse, soas to restore its filtering capacity.

In the conventional swimming pool filter, utilizing a filter bagsupported within a casing, it becomes necessary to open up the casing,to remove the bag and to dump its collected refuse, in order to restoreits specified filtering capacity. The operation is a time consuming one,and constitutes a sizeable item of expense to a swimming pool owner, inservice charges.

The primary object of this invention is to provide a filter that can becleaned without removing the bag or even opening the casing, it beingnecessary only to change the settings of valves controlling thecirculation of water through the filter.

More specifically, the invention provides for a back wash operation inwhich the refuse is washed away from the interior of the filter bag andis drained 011 from the filter through a scavenging outlet.

A further object is to provide the foregoing improved features in afilter that is quite simple and uncomplicated, and yet durable andthoroughly dependable in operation.

Other objects will become apparent in the following specifications andappended drawings, wherein:

Fig. 1 is a view, partially in side elevation and partially in section,showing a filter embodying the invention; and

Fig. 2 is a plan view, partially in horizontal section, taken asindicated by the line 2-2 of Fig. 1.

Referring now to the drawing in detail, I have shown, as an example ofone form in which the invention may be embodied, a filter that isinterposed in a circulation line including an inlet conduit 5 comingfrom a pump, as indicated, and a return conduit 6 leading back to aswimming pool. The filter includes a casing 7 which is mounted on a base8. Base 8 may be of drum shape, including a cylindrical wall 9, a bottomflange 10 projecting outwardly, and top flanges 11 and 11 projectingoutwardly and inwardly respectively, and a sump 12 which functions asthe bottom of easing 7. Casing 7 includes a bottom flange 13 projectingoutwardly and covering flanges 11 and 11; a cylindrical lateral wall 14,and a dome 15 closing its upper end. Attached to lateral Wall 14 is anipple 16 to which return conduit 6 may be connected, with a gate valve17 interposed. Flange 13 is anchored to flange 11 by bolts or screws 18.

Within casing 7 is a retainer cage 19 including a perforated cylindricallateral wall 20 of perforated metal, a perforated head 21 at its upperend, and a mounting flange 22, projecting outwardly, at its lower end.Flange 22 is sandwiched between flanges 11' and 13, and has a marginaldiameter slightly less than the diameter between bolts 18, the peripheryof flange 22 locating against bolts 18 so as to position the cage 19 inconcentric relation to casing 14. Cage 19 is of smaller diameter thancasing 14, wherebyv a circulation space 23 is defined therebetween. Thehead 21 is spaced below dome 15 to define a head space 24.

2,851,164 Patented Sept. 9, i958 "ice Supported within cage 19 is afilter bag 25, of wire mesh or woven fabric (e. g. Orlon) material. Bag25 includes a cylindrical body portion 26, a head 27 closing its upperend, and a radially outwardly projecting flange 28 at its lower end,which is open. The flange 28 is clamped between flanges 22 and 11'. Head27 is supported by a header disc 29 which in turn is suspended by meansof a stem secured to the center thereof and projecting upwardly througha central aperture in bag head 27. At its upper end, stem 30 has athreaded portion onto which is threaded a wing nut 31. Stem 30 extendsthrough a central aperture in head 21 of cage 19 and wing nut 31 bearsagainst the upper face of head 21 to provide releasable support ofheader 29, from the cage.

Projecting upwardly through the center of sump 12 is a nozzle tube 32the upper portion of which is provided with a multiplicity of apertures33. The upper end of tube 32 is closed. Its lower end, projecting belowsump 12, is connected to inlet conduit 5, which may be provided with avalve 34 for controlling the flow from the pump.

Defined within filter bag 25 is a receiving and waste collecting chamber35, closed at its bottom by sump 12. A scavenging outlet for thischamber is provided by an outlet tube 36, which may normally be closedby a cap 37 threaded on the outer end thereof (or by a valve which Wouldnormally be closed).

In dome 15 is an air inlet vent 38, normally closed by a cap 39 (or avalve).

Operation In the normal filtering operation of the apparatus, scavengingoutlet 36 and vent 38 are closed, valve 17 is open, and valve 34 ispartially open, to provide a moderate flow of water from the pump intonozzle tube 32, from which it flows through apertures 33 into collectingchamber 35. From chamber 35, the water escapes through collecting bag 25and cage 19 into annular chamber 23, from which it passes into outletconduit 6. All foreign matter carried by the water will be arrestedagainst bag 25 and will collect in chamber 35.

When refuse has collected in chamber 35 or on filter bag 25 to the pointwhere filtering capacity is impaired, the apparatus may be restored tofull filtering capacity by closing valve 17, removing cap 37 (or openingthe valve at that location, if one is used) and allowing the pressure ofthe incoming water to flush the refuse from chamber 35 out throughoutlet 36, until chamber 35 is emptied or nearly emptied. Valve 34 maythen be opened wide so as to deliver from the upper end of nozzle tube32 a multitude of jets traversing the air space from tube 32 to bag 25and impinging onbag 25 with suflicient force to dislodge foreignparticles wedged between the meshes of the bag. Such foreign particleswill be flushed into sump 12 and thence out through outlet 36.

When the cleansing and scavenging operation is sufficiently completed,it is only necessary to close outlet 36, to reopen valve 17, and toregulate 34 to point where the proper rate of flow for normal filteringoperations is provided.

Only in the event that the filtering bag should deteriorate so as torequire replacement by a new bag would it become necessary to open upthe apparatus.

I claim:

1. In a swimming pool filtering apparatus: a base including supportingmeans and a waste collection sump carried thereby; an imperforate casinghaving an open lower end provided with an external radial flangeattached to said base; a filter bag in said casing in an invertedposition, said bag having an open lower end provided with a rim flangeclamped between said sump and said casing flange and having a closedupper end; an aperture cage within said casing and surrounding andsupporting said bag, said cage including a lateral wall member inclosely spaced relation to the inner wall of the casing and including atop member and an open lower end provided with a rim flange clampedbetween said bag flange and said-casing; an apertured disc within saidbag, engaged beneath the top portion thereof to support the bag andhaving a stud attached to its center and projecting upwardly throughsaid top portion of the bag and through said upper end member of thecage and attached to the latter; a nozzle tube extending through saidsump and rising in said chamber to a point near the top thereof, saidnozzle tube having a plurality of nozzle apertures through which jetsmay be directed laterally into said chamber; a service outletcommunicating With said casing for carrying filtered water away from theapparatus: a scavenging outlet communicating with said sump for carryingaway collected refuse from said chamber when said scavenging outlet isopenand said service outlet is closed; closure means normally closingsaid scavenging outlet; and means for closing said service outlet todirect scavenging fiow to said scavenging outlet when said closure meansis opened.

2. In a swimming pool filtering apparatus: a base including supportingmeans and a waste collection sump carried thereby; an imperforate casinghaving an open lower end provided with an external radial flangeattached to said base; a filter bag in said casing in an invertedposition, said bag having an open lower end provided with a rim flangeclamped between said sump and said casing flange and having a closedupper end; an

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aperture cage within said casing and surrounding and supporting saidbag, said cage including a lateral wall member in closely spacedrelation to the inner Wall of the casing and including a top member andan open lower end provided with a rim flange clamped between said bagflange and said casing; an apertured disc within said bag, engagedbeneath the top portion thereof to support the bag and having a studattached to its center and projecting upwardly through said top portionof the bag and through said upper end member of the cage and attached tothe latter; an inlet communicating with said sump for delivering waterthereto; a service outlet communicating with said casing for carryingfiltered water away from the apparatus; scavenging outlet communicatingwith said sump for carrying away collected refuse from said chamber whensaid scavenging outlet is open and said service outlet is closed;closure means normally closing said scavenging outlet; and means forclosing said service outlet to direct scavenging flow to said scavengingoutlet when said closure means is opened.

References Cited in the file of this patent UNITED STATES PATENTS1,453,310 Engel May 1, 1923 1,585,246 Hoy May 18, 1926 FOREIGN PATENTS346,094 France Q Nov. 11, 1904 351,304 France May 3, 1905

